Fire-box.



PATENTED OCT. 13, 1903.

W. D. BOYCE.

FIRE BOX.

APPLICATION FILED MAR. s. 1902.

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PATENTED 001". 13, 1903.

W. D. BOYCE.

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'ATENT Patented October 13, 1903.

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WILLIAM D. BOYCE, OF ST. LOUIS, MISSOURI.

FIRE-BOX.

SPECIFICATION forming part of Letters Patent No. 741,218, dated October 13, 1903.

Applioationfiled March 3, 1902.

T0 at whom it may concern.-

Be it known that I, \VILLIAM D. Boron, a citizen of the United States, residing at city of St. Louis, State of lllissouri, have invented a certain new and useful Improvement in Fire-Boxes, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is 'a view partly in rear elevation and partly in transverse vertical sectional elevation. Fig. 2 is a longitudinal sectional elevation on the line'2 2 of Fig. 1, and Fig. 3 is a fragmentary sectional plan view on the line 3 3 of Fig. 2. I

My invention relates to improvements in fire-boxes for steam-boilers and the like, my object being to so construct a fire-box that the disturbance of the temperature due to firing is greatly reduced and an increased heating-surface is presented.

To these ends and also to improve generally upon devices of the character indicated my invention consists in the various matters hereinafter described and claimed.

Referring now more particularly to the drawings, 1 represents the outer plate of the fire-box, whichforms the top and side walls thereof, 8 represents the back plate, and 11 indicates the front plate, said plates 1 and 11 being connected to the boiler shell or casing 12 in the usual manner when the fire-box is used in connection with a boiler, 10 indicating the tubes or flues of such aboiler. Spaced from the said plate 1 are plates 13, which form the outer side and top walls of fire-chambers 6, plates 7 forming the inner side walls of said chambers. The said fire chambers do not extend the full length of the fire-box leg, whereby water-spaces are left at their front and rear in a manner usual in fire-boxes, and the ends of said fire-chambers are closed by plates 14, which extend only between the walls of the respective fire-chambers, a space communicating with the customary front, rear, and top water-spaces being thus left between the adjacent inner walls 7 of the fire chambers. Stay-bolts 15 connect the plates forming the outer walls of the fire-box with the plates forming the walls of the fire-cham- Serial No. 96,475. (No model.)

bers, and a separate door 9 opens into each of the fire-chambers 6.

The plates 1 and 13 are supported upon beams 2, which form the outer walls of the ash-pits 3, an intermediate beam or wall 4 serving to separate said ash-pits from each other and each ash-pit being provided with doors 5, whereby the usual single ash-pit is thus in effect separated into chambers, there being a separate ash-pit .for each of the firechambers The adjacent inner walls 7 of the said fire-chambers are supported upon the said beam 4-, and thus form in effect a partition which separates the said two fire-chambers, said walls 7 being spaced apart and c011- nected by stay-bolts 16.

Manifestly, as shown most clearly in Fig. 3, the stay-bolts do not extend over the entire area of the front and back plates of the firebox, there being aspace between said bolts which extends across the space between the walls 7 of the two fire-chambers In order to brace and strengthen this portion of the said fire-box walls not provided with staybolts, I secure vertically pairs of angle-irons 17 to said front and rear plates, and between the adjacent flanges of said angle-irons I secure tie-rods 18 and 19, said tie-rods lying in the space between the'walls 7 or in the plane of said space between the upper stay-bolts 15.) The tie-rods 18, which are at the upper portion of the fire-box, have their forward ends connected to the plate 1 or to the shell of the boiler in any appropriate manner, while the lower tie-rods 19 extend between and are fastened. to the sets of angle-irons upon the front and rear plates of the fire-box. In this manner the said fire-box plates are strengthened at the desired places, and are furthermore, firmly braced by the tie-rods, said tierods lying in convenient spaces whereby they can be readily positioned.

The fire-box is here shown as applied to a boiler 5 but it is manifest that it can be employed alone or with any apparatus of any desired type.

As will at once be apparent, the spaced walls 7 of the separate fire-chambers afford an additional heating-surface, thus increasing the heating capacity of the fire-box over a box of the same size provided with the customary single fire -chamber. Furthermore,

each fire-chamber can be independently supplied with fuel, raked, or otherwise attended to, and therefore the fire can be fed or otherwise given attention without, for example, feeding green fuel to the entire fire-box at one time. Thus the disturbance to the temperature of the fire-box is greatly reduced, and by alternately feeding the two fire-chambers it is possible to keep the temperature of the box as a whole almost or quite constant.

I am aware that many minor changes in the construction, arrangement, and combination of the several parts of my device can be made and substituted for those herein shown and described without in the least departing from the nature and principle of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a fire-box, an inclosing shell, an end casing-plate, interior walls spaced apart and dividing said fire-box, said casing end plate extending across the space between said walls, and a tie-rod secured to said end plate and extending in the space between said walls; substantially as described.

2. In a fire-box, an outer plate, inner plates, interior walls connected to said inner plates and dividing the fire-box, said interior walls being spaced apart, stay bolts connecting said inner and outer plates, there being a space between said bolts in the plane of the space between said walls, a casing end plate extending across the space between said walls and said stay-bolts, and a tie-rod connected to said end plate and extending in the space between said stay-bolts; substantially as described.

3. In a fire-box, an outer end plate, firechambers having end plates and provided with inner walls spaced apart, said outer end plate extending across the space between said walls, stay-bolts between said end plates, and'a strengthening member upon said outer end plate in the space between said stay-bolts; substantially as described.

4;. In a fire-box, an outer end plate, firechambers having end plates and provided with inner walls spaced apart, said outer end plate extending across the space between said walls, stay-bolts between said end plates,

a strengthening member upon, said outer end plate in the space between said stay-bolts, and

a tie-rod connected to said strengthening member; substantially as described.

5. In a fire-box, interior fire-chambers having end plates and inner walls spaced apart, an outer end plate at one end of said firechambers and extending across the space between said inner walls, stay-bolts between the said outer end plate and the end plates of said firechambers, a second outer end plate at the other end of said fire-chambers and extending across the space between said inner walls, stay-bolts between said second outer end plate and the end plates of said firechambers, a strengthening member upon each said outer end plate in the space between the said bolts connected thereto, and a tie-rod extending in the space between said walls and having its opposite ends connected to said strengthening members, substantially as deangle-irons upon said end plates in the spaces between said stay-bolts, a tie-rod connecting the angle-irons upon the respective outer end plates and extending in the space between said inner walls, and atie-rod secured to the angle iron upon one of the said outer end plates and extending in the space between the stay-bolts connecting said top plates; substantially as described.

In testimony whereof I hereunto aflix my signature, in the presence of two witnesses, this 28th day of February, 1902.

WILLIAM D. BOYCE.

' WVitnesses:

GEORGE BAKEWELL, GALES P. MOORE. 

